diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e43b0f9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.DS_Store
diff --git a/Bottle Adapter/adapter.scad b/Bottle Adapter/adapter.scad
new file mode 100644
index 0000000..ef5852b
--- /dev/null
+++ b/Bottle Adapter/adapter.scad	
@@ -0,0 +1,68 @@
+/*
+	module Adapter
+
+	parameters:	
+    - height         is the height of the Adapter (top to bottom)
+    - top_radius     is the top radius
+    - bottom_radius  is the bottom radius
+ */
+
+module Adapter(height, top_radius, bottom_radius) {
+   $fn = 128;
+   difference() {
+       cylinder(h = height, r1 = bottom_radius, r2 = top_radius);
+       translate([0,0,-0.5])
+       cylinder(h = height+1, r1 = bottom_radius*0.9, r2 = top_radius*.8);
+   }
+}
+
+
+/*
+	module PolyRing
+
+	parameters:	
+    - height         is the height of the Adapter (top to bottom)
+    - radius         is the outer radius of the ring (inner radius is 80% of outer)
+    - sides          is the number of sides at the ring
+ */
+
+module PolyRing(height, outer_radius, inner_radius, sides) {
+   $fn = sides;
+   difference() {
+        cylinder(h = height, r = outer_radius);
+
+        translate([0,0,-0.5])
+        cylinder(h = height+1, r = inner_radius);
+    }
+}
+
+/*
+	module BottleAdpater
+
+	parameters:	
+	- radius         is the radius defining the outer circle
+    - height         is the height of the Adapter (top to bottom)
+ */
+
+module BottleAdapter(radius, height, adapter_radius) {
+    union() {
+        PolyRing(height/6, radius, radius*.6, 128);
+        
+        translate([0, 0, height/6]) {
+          PolyRing(height/4, radius*0.95, radius*0.7, 8);
+        }
+        
+        translate([0, 0, height*5/12]) {
+          PolyRing(height/8, radius*0.95, radius*0.7, 128);
+        }
+        
+
+        translate([0, 0, height/2]) {
+          Adapter(height/2, adapter_radius, radius*.8);
+        }
+    }
+}
+
+BottleAdapter(32, 60, 40);
+rotate([180, 0, 0])
+BottleAdapter(32, 60, 32);
\ No newline at end of file